Transient noise

Hi Team

I have some problem with transient noise. I have read a few posts here and I need more help, please.

I am designing a receiver system (TSMC pdk) with several stages of sample and hold. And the whole circuit is controlled by several digital clock signals. 

The input stage is a LNA. However,  I'd like to find out the noise performance of the whole circuit to test if my LNA is good enough. 

Q1 I am relatively new to cadence. To the best of my knowledge, I can not use PSS and PNOISE function to simulation a sampled circuit. Am I right?

Q2: What simulation tools should I use to simulate the noise performance?

Q3. I am currently using transient noise to simulate the circuit. But I have a problem filling the blanks. 

This is what I found: "noise fmax: The bandwidth of pseudorandom noise sources. A valid (nonzero) value turns on the noise sources during transient analysis. The maximal time step of the transient analysis is limited to 1/noisefmax."

and from Andrew's previous reply to someone: "If you had noise at infinite frequency, you'd have to have infinitely short time steps. So by telling the simulator the maximum frequency, that sets the maximum timestep that the simulator can take - the higher the frequency, the shorter the timestep (it may take shorter timesteps than the maximum noise frequency dictates in order to follow the waveforms within your specified tolerances). Also, the transient noise assumes that the noise is white, based on the values at noise fmax"

If I understand it correctly, in my case, should fmax equal to the LNA bandwidth (100MHz~1GHz, which means fmax=900MHz)? 

Q4 What is the noise model of transient noise simulation? Is it assuming a white noise source at the input of the receiver with the fmax as the bandwidth? What power spectrum density does it assume? Or does the simulator actually generate the noise at each circuit nodes? So does it include all the noise sources? (flicker, heat etc.)

Thanks

Minghao